Hager 3981-C Small Format Inte...
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$69.95
$66.11
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Hager 3981-C Small Format Interchangeable Core, Combinated 6-Pin with Best Keyways, Satin Brass

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Model: 3981-C US4

In Stock (leaves warehouse same day if ordered before 3pm ET)

$69.95
$66.11
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Hager 3981-C Small Format Interchangeable Core, Combinated 6-Pin with Best Keyways

The Hager 3981-C is a Small Format Interchangeable Core (SFIC) designed for commercial-grade mechanical lock applications. This combinated, 6-pin core is factory-keyed and configured to Best keyways, delivering a reliable and secure foundation for interchangeable core lock systems. Finished in Satin Brass, the 3981-C is a genuine Hager replacement part engineered to integrate seamlessly with compatible Hager lock hardware in demanding commercial environments.

Key Features

  • Small Format Interchangeable Core (SFIC): Designed for small format IC-compatible lock cylinders, enabling tool-free core removal and replacement for streamlined key management in commercial facilities.
  • Combinated Configuration: Arrives factory-combinated, ready for installation into compatible Hager lock hardware without additional pinning required on-site.
  • 6-Pin Cylinder: Six-pin tumbler design provides enhanced security and key combination depth compared to standard 5-pin configurations.
  • Best Keyways Compatibility: Configured to Best keyways for compatibility with Best-keyway interchangeable core key systems widely used in commercial access control applications.
  • Satin Brass Finish: Features a Satin Brass finish for a professional appearance that coordinates with a broad range of commercial door hardware.
  • Genuine Hager Replacement Part: Engineered as an OEM replacement component for Hager mechanical lock systems, ensuring proper fit and function with compatible hardware.
  • Commercial-Grade Construction: Built to the performance standards required for commercial applications, including offices, educational facilities, and institutional environments.

Technical Specifications

  • Department: Door Hardware
  • Product Category: Mechanical Locks
  • Product Group: Parts and Accessories
  • Subcategory: Parts and Accessories
  • Product Subgroup: Parts and Accessories
  • Product Type: IC Core
  • Parts and Accessories Type: Replacement Parts
  • Commercial/Residential: Commercial
  • Product Model: 3981-C
  • Features: Hager Lock Parts

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities and Schools
  • Healthcare Institutions and Medical Offices
  • Government and Municipal Buildings
  • Multi-Tenant Residential and Mixed-Use Properties
  • Industrial and Warehouse Facilities
  • Retail Establishments

Why Hager 3981-C?

The Hager 3981-C delivers the precision and reliability expected from a genuine OEM interchangeable core replacement part. With a combinated 6-pin configuration and Best keyway compatibility, this SFIC core supports efficient key control and quick core changeovers critical to professional commercial lock management. Facilities managers and security professionals can trust the 3981-C as a specification-grade component built to Hager's commercial door hardware standards.

Manufacturer Resources

Product Specs

Department:
Door Hardware
Product Category:
Mechanical Locks
Product Group:
Parts and Accessories
Subcategory:
Parts and Accessories
Product Subgroup:
Parts and Accessories
Product Type:
IC Core
Parts and Accessories Type:
Replacement Parts
Commercial/Residential:
Commercial
Product Model:
3981-C
Features:
Hager Lock Parts

Hager 3981-C US4 – Frequently Asked Questions

1) Will the Hager 3981-C core work in my existing Best SFIC key system?
The 3981-C is a small format interchangeable core built to Best keyways, so it drops into an existing Best-keyway SFIC system and works with the control and operating keys already cut for that keyway. It is a 6-pin core, so it belongs in a 6-pin Best system rather than a 7-pin one.
2) Does the Hager 3981-C come already keyed, or do I have to pin it myself?
It ships combinated from the factory, pinned and ready to install. No on-site pinning or key machine work is needed. You will need the control key for that keyway to seat or remove it in the housing.
3) Will a 6-pin Hager 3981-C core fit a housing prepped for small format interchangeable cores?
Yes. Small format IC housings take a figure-eight core regardless of whether it is pinned 6 or 7 chambers, so the 6-pin 3981-C seats in any SFIC-prepped cylinder, lever, mortise housing, padlock or exit device trim. What has to match is the keyway family, which here is Best.
4) Will a Schlage 20-207 core drop into a housing built for the Hager 3981-C?
No. The Hager 3981-C is a small format interchangeable core (SFIC) cut to Best keyways, while the Schlage 20-207 is a full-size interchangeable core (FSIC/LFIC) in the S123 keyway. The two use different core geometry, so a large format core will not seat in a small format housing and vice versa. Match the core format to the cylinder housing already in the lock before ordering either one.
5) We are standardizing a building on one key system - how do the Hager 3981-C and Schlage 20-207 differ for key control?
They belong to two different keyway families. The Hager 3981-C is combinated to Best keyways, so it folds into an existing Best-keyway interchangeable core system. The Schlage 20-207 is supplied in the S123 keyway. A facility cannot key both to the same system, so pick the keyway family the rest of your cores already use and stay with it across the doors.
6) Is the Schlage 20-207 a cheaper drop-in swap for a Hager 3981-C in a commercial retrofit?
It is not a swap. The 3981-C is a commercial-grade replacement SFIC core for Hager mechanical lock hardware, arriving factory-combinated so no on-site pinning is needed. The Schlage 20-207 is a sub-assembled large format core in the S123 keyway, a different core format and a different keyway. Neither substitutes for the other in the same cylinder; the decision is made by the housing and the existing key system, not by preference.
7) What finish does the Hager 3981-C interchangeable core come in?
Satin brass, BHMA finish code 606. That is the only finish offered on the 3981-C, and it coordinates with satin brass levers and mortise trim on the rest of the opening.
8) Is the Hager 3981-C a residential or commercial core?
Commercial. It is specified as a commercial mechanical lock replacement part, and the interchangeable core format exists so a facility can rekey a door in seconds rather than pull the lock apart. Typical use is offices, schools, healthcare, government buildings and multi-tenant properties.
9) Why choose a 6-pin core over a 5-pin for a building rekey?
Six chambers give more key combinations and more depth for masterkeying, which matters when you are building a master system across a lot of doors rather than keying a single opening. The 3981-C uses the 6-pin configuration.
How fast can I get the Hager 3981-C US4 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Hager 3981-C US4 come with a warranty?
Absolutely. The Hager 3981-C US4 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Hager 3981-C US4?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Hager 3981-C US4 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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